HTML редактор

<!doctype html>
<html lang="ru">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>JavaScript Accordion - Example 1</title>
  <style>
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
      font-size: 1rem;
      font-weight: 400;
      line-height: 1.5;
      color: #212529;
      text-align: left;
      background-color: #fff;
    }

*,
    *::before,
    *::after {
      box-sizing: border-box;
    }

.accordion__item {
      margin-bottom: 0.5rem;
      border-radius: 0.25rem;
      box-shadow: 0 0.125rem 0.25rem rgb(0 0 0 / 15%);
    }

.accordion__header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.75rem 1rem;
      color: #fff;
      font-weight: 500;
      background-color: #0d6efd;
      border-top-left-radius: 0.25rem;
      border-top-right-radius: 0.25rem;
      cursor: pointer;
      transition: background-color 0.2s ease-out;
    }

.accordion__header::after {
      flex-shrink: 0;
      width: 1.25rem;
      height: 1.25rem;
      margin-left: auto;
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23ffffff'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
      background-repeat: no-repeat;
      background-size: 1.25rem;
      content: "";
    }

.accordion__item_show .accordion__header::after {
      transform: rotate(-180deg);
    }

.accordion__header:hover {
      background-color: #0b5ed7;
    }

.accordion__item_hidden .accordion__header {
      border-bottom-right-radius: 0.25rem;
      border-bottom-left-radius: 0.25rem;
    }

.accordion__body {
      padding: 0.75rem 1rem;
      overflow: hidden;
      background: #fff;
      border-bottom-right-radius: 0.25rem;
      border-bottom-left-radius: 0.25rem;
    }

.accordion__item:not(.accordion__item_show) .accordion__body {
      display: none;
    }
  </style>
</head>

<body>

<div class="accordion" id="accordion-1" style="max-width: 30rem; margin: 1rem auto 2rem;">
    <div class="accordion__item accordion__item_show">
      <div class="accordion__header">
        Заголовок 1
      </div>
      <div class="accordion__body">
        Lorem ipsum dolor, sit amet consectetur adipisicing elit. Tenetur et numquam optio, aut consequuntur iure magni
        tempore quo, velit, quos ipsum perferendis sit quidem sapiente voluptatem nesciunt rerum soluta amet.
      </div>
    </div>
    <div class="accordion__item">
      <div class="accordion__header">
        Заголовок 2
      </div>
      <div class="accordion__body">
        Lorem ipsum dolor sit amet consectetur adipisicing elit. Non earum deleniti recusandae placeat rem eius quod
        aliquid adipisci nemo alias debitis corporis pariatur quibusdam est, porro fuga id iure vero?
      </div>
    </div>
    <div class="accordion__item">
      <div class="accordion__header">
        Заголовок 3
      </div>
      <div class="accordion__body">
        Lorem ipsum dolor sit amet consectetur, adipisicing elit. Aliquid repellat dicta vel sapiente laudantium minima
        porro voluptatem nam, alias aliquam qui quasi eveniet odit fugiat eius aspernatur nesciunt veniam expedita!
      </div>
    </div>
  </div>

<div class="accordion" id="accordion-2" style="max-width: 30rem; margin: 1rem auto;">
    <div class="accordion__item accordion__item_show">
      <div class="accordion__header">
        Заголовок 4
      </div>
      <div class="accordion__body">
        Lorem ipsum dolor, sit amet consectetur adipisicing elit. Tenetur et numquam optio, aut consequuntur iure magni
        tempore quo, velit, quos ipsum perferendis sit quidem sapiente voluptatem nesciunt rerum soluta amet.
      </div>
    </div>
    <div class="accordion__item">
      <div class="accordion__header">
        Заголовок 5
      </div>
      <div class="accordion__body">
        Lorem ipsum dolor sit amet consectetur adipisicing elit. Non earum deleniti recusandae placeat rem eius quod
        aliquid adipisci nemo alias debitis corporis pariatur quibusdam est, porro fuga id iure vero?
      </div>
    </div>
    <div class="accordion__item">
      <div class="accordion__header">
        Заголовок 6
      </div>
      <div class="accordion__body">
        Lorem ipsum dolor sit amet consectetur, adipisicing elit. Aliquid repellat dicta vel sapiente laudantium minima
        porro voluptatem nam, alias aliquam qui quasi eveniet odit fugiat eius aspernatur nesciunt veniam expedita!
      </div>
    </div>
  </div>

new ItcAccordion('#accordion-1');
    new ItcAccordion('#accordion-2');
  </script>

</body>

</html>